Cryptographic attachment for type-writing machines.



BI H. HEBERN & F. HOFFMA CRYP'IQGRAPHICATTACHMENT FOR'TYPE WRITINGMAUHINES.

v n-ucm zox'rnsn s ap-2.0.1912 4 q 1,123,738. Patented-Ja 5, 1915.

IN V EN TORS.

WITNESSES Edward H. Hebern V EDWARD H. HEBERN AND FRED HQFFMAN, 0F OAKLAND, CAIJQEGBNEA.

CRYFTGGRAPHIC AITAGEL'MENT 78GB TYPE-WRITZNQ MACHINES.

Specification cf 3: fitters Fat-ant.

Patented Jan. 15911 5'.

Application i'lcfi September 2, 1313 Serial No 787.570.

To all whom it may concern Be it known that We, EDWARD H. Hnnnnn and Fnsn HOFFMAN, citizens of the United States. residing at Oakland, State of California, have invented new and useful Intprovemcnts in Cryptographic Attachments for T ypcVVriting Machines, of which. the following is a specification.

The object of the present invention is to pro ide an attachmcnt for typewriting machines enabling it to ho nsrd for sinniltaneously converting a. into cipher and typewriting the message so converted, and which can also he used to simultaneously typewrite and decipher the message.

A furthcr object is to provide such a device which will. permit the use of codes very small and compact in size, so as to be easily carried on the person when traveling, and thus maintained in perfect secrecy, and which codes can be used in conjunction, with any such attachment, so that tho attach ment itself ncsd not no transportr-el with the person so traveling.

Tn tlw accompanying drawing, Figure 1 is a. perspective view of a portion of a typo writing machine equipped with the inr proved attachment; 2 is s section thereof; Fig. 3 is a perspective 'v' of a slide piece detached; 4 is a sirsilar View of a removable code strip; Fig. 5 is a similar view of a letter lvlock detached.

Referring to the drawing, 1. indicates a typcwriting machine, having end bars Upon said end bars rest plates 3, having up ward extensions 4-, bent outward at the upper portion, as shown at 5, to form convenicnt lifting means. Through vertical slots 6 in said extensions pass screws 7, tho inner ends of which screw into depending portions 8 of longitudinal bars 9 thereof, through which pass upwardly two screws 11 screwed into upper and lower longitudinal channol lates 12 and 13. Said upper channel plate 12 and also an intermediate channel plate 14, have formed integral there with on their front sides depending vertical members 15, it the vertical member l5 be ing secured by screws to thc rm? edge of the intermcdiate channel plate. and the verica '16 being sir M. a l sccnrod to tho rear edge of the lower channel plate l3. Um cring the channel plates thin strips 1%. of cclinloid or other transparent s ats rirzl, mtsnd r'ig the full length of tho nei pinto. and serving to protect said {shranncl from the entrance of dust. (savoring the stri s '13. in said channel plains arc corcr plates 11 2t, 21, the lowerm t 1 r plats 21 using bent dc-wnwardlv ct odg s and hung there see-cu ed. by s nw.

members 15-. 1G. hy ccrovvs thr igh parts intervening bctween ti l: vsral and slidcways.

bent downward at the crlgc of scar dowa'iwnrlil plate ill sccnrcd h; 3 throug said downwardly cxtcnding portion of the. upper covcr plate and into thc rear edge of the upper channel plate 12. The channels in each channel plate thus form, with the adjacent portions of tho of lluloicj' strips 18. guideways 26, in which can .rlidc code strips 27, made of any suitable mate. rial, prci'orably fiber as being compressible. Zach code strip has a longitudinal series of. holes or recesses 28, and, closely fitting in said holcs are removable letter blocks 29, preferably of different color from the code strip and having marked thereon characters 31, such as letters or numbers. These letter blocks, when placed in said recesses, are sscurclv held therein by reason of the conr prcssihility of the strips. The characters 31 are adapted to be seen through suitably shaped holes 82 formed on the correspond. ing cover plate.

33 indicates slidc pieces which can slide \ertically in the vertical slidcwnys 23, and are retained therein becanso the: vertical slots 22 arc narrower than the vertical slide- The uppermost covcr plate 19 pper 11rd Mum/i (m mid using said kevs meters immedim of the third M ni .11- r mmed r e- :1 ahape to ht i 01pm 1'; fed

his pressure mic and from a timing the en mi vh arwzters and as d .rme mh 4r sham tars mnding to those x-h chmwmta-t; is in r ludvd, 13AM? by,

spective iv immciiiately above i112? second and fiizird? sf the Former rows, and two to '10. GM} uf finger piems, msfpectivxly Emmediamly above first m0 z'uws 9f masters, and opemiiw iy connect m'i rospectivfly vviih the zype'wrfieti of the seem-:3 and 'hirfi mm in tesiinwny wherec f we Emve herevnto W'iinesses Fm'zml's M. Wmuam f) B. REPHARDS. 

